Nav: Home

Both Sn and Zn single-atoms on CuO catalyst synergistically promote dimethyldichlorosilane synthesis

February 06, 2020

Because of their maximum atom-utilization efficiency and unique catalytic properties, single-atom catalysts (SACs) have sparked intense interests in recent years. However, most of the reported SACs are limited to single-site active components, with rare reports on catalyst promoters in their single forms. Because promoters are essential components in many industrial catalysts, the exploration of the preparation of single-site promoters should be of great interest in catalysis, both in fundamentals and application researches. Similar to SACs, these single sited promoters have the structural simplicity and homogeneity, and its synergistic effect on the catalytic reaction should be unique but yet clarified.

In a recent article published in the Beijing-based National Science Review, scientists at the General Research Institute for Nonferrous Metal (GRINM) in Beijing, China, GRIPM Advanced Materials Co., Ltd. In Beijing, China and Institute of Process Engineering, Chinese Academy of Sciences in Beijing, China, have designed and synthesized an atomically dispersed co-promoters of Sn and Zn on the CuO surface. As demonstrated, this catalyst exhibited greatly enhanced promoting effect in the industrially important Rochow reaction for dimethyldichlorosilane synthesis. Also, for the first time, the synergistic promotion mechanism has also been revealed.

The authors employed a facile hydrothermal method to synthesize Sn1/CuO with a large number of surface Cu vacancies. Furthermore, they investigated the structure of this new catalyst employing various characterization methods and proved the successful uploading of the two single-site promoters. The XPS data gave direct evidence that there is a strong interaction between Sn and Zn atoms. "After incorporation with Zn atoms, the binding energy of Cu 2p3/2 peak shifts to lower-energy side in comparison with that of CuO, and this shift is observed obviously in 0.1Zn1-Sn1/CuO, indicating an increase of the electron density on the Cu atoms with the coexistence of Sn and Zn atoms," they state. Direct experimental results showed that these defect sites generated by incorporating single-site Sn could further stabilize single-site Zn (see below figure). "Density functional theory (DFT) calculations also show that on Sn-doped CuO(110) surface, the formation energy of Cu vacancy is 0.78 eV lower than that on the clean CuO(110), which indicates it is easier to form Cu vacancies in the Sn-doped surface," they add. The calculation results also support that Zn prefers to fill in the nearby Cu vacancies caused by Sn doping to form Sn-Zn pairs.

Comparing with the conventional catalysts with promoters in the form of nanoparticles, this novel Zn1-Sn1/CuO catalyst has much higher activity, selectivity, and stability in the synthesis of dimethyldichlorosilane via the industrially important Rochow reaction. The enhanced catalytic performance is attributed to the synergistic interaction between single-site Sn and Zn co-promoters, which leads to the change in the electronic structure of CuO and thus promotes the adsorption of reactant molecules.

"These single-sited promoters not only help to elucidate their real promotion mechanism in catalytic reaction, but also open up a new path to optimize catalyst performance," they state in an article titled "Single-atom Sn-Zn pairs in CuO catalyst promote dimethyldichlorosilane synthesis."

This work got the supports of Dr. Wenxin Chen in Beijing Institute of Technology, China; Prof. Jianmin Ma in Hunan University, China; Prof. Ziyi Zhong in Guangdong Technion Israel institute of Technology (GTIIT), China; and Prof. Yadong Li in Tsinghua University, China.

"This work provides a new understanding of the synergistic effect among various promoters and will offer avenues to the design of new co-promoters in catalysts for industrial reactions," they believe.
This research received funding from the National Natural Science Foundation of China (Nos. 21878301 and 21978299) and the project from the Multiphase Complex Systems (MPCS-2017-A-01).

See the article:

Qi Shi, Yongjun Ji,* Wenxin Chen, Yongxia Zhu, Jing Li, Hezhi Liu, Zhi Li, Shubo Tian, Ligen Wang,* Ziyi Zhong, Limin Wang,* Jianmin Ma, Yadong Li and Fabing Su*

Single-atom Sn-Zn Pairs in CuO Catalyst Promote Dimethyldichlorosilane Synthesis

National Science Review, nwz196

Science China Press

Related Catalytic Reaction Articles:

Successful improvement of the catalytic activity of photosynthetic CO2 fixing enzyme Rubisco
A research group consisting of Associate Professor FUKAYAMA Hiroshi (Kobe University) and Professor MATSUMURA Hiroyoshi (Ritsumeikan University) et al. have succeeded in greatly increasing the catalytic activity of Rubisco, the enzyme which fixes carbon from CO2 in plant photosynthesis.
Heat smarter, not harder -- How microwaves make catalytic reactions more efficient
Scientists at Tokyo Institute of Technology (Tokyo Tech) and International Christian University (ICU) demonstrate a synchrotron X-ray spectroscopy-based method by which the local temperatures of metal nanoparticles can be measured under microwaves.
Tandem catalytic system efficiently converts carbon dioxide to methanol
Boston College chemists have used a tandem catalytic system to efficiently convert carbon dioxide to methanol.
Dancing chemicals: Innovative catalytic reaction for low-cost synthesis of aromatic esters
Aromatic esters are a versatile group of compounds that are commonly used as feedstock in the chemical industry.
Electrochemical reaction powers new drug discoveries
A Cornell-led collaboration is flipping the switch on traditional synthetic chemistry by using electricity to drive a new chemical reaction that previously stumped chemists who rely on conventional methods.
Newly designed ligands for a catalytic reaction to synthesize drugs and useful compounds
In a new study, scientists at Gwangju Institute of Science and Technology developed novel ligand molecules, which facilitate a catalytic reaction that generates useful compounds called chromanones.
Researchers shed light on new enzymatic reaction
Researchers have discovered that repurposed enzymes and light are key to producing chemical compounds in an environmentally friendly fashion.
Is the simplest chemical reaction really that simple?
New research by scientists at the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) has shown, surprisingly, in the simplest, well-studied reaction, there is still uncovered mechanism.
Water is key in catalytic conversion of methane to methanol
Scientists reveal new details that explain how a highly selective catalyst converts methane, the main component of natural gas, to methanol, an easy-to-transport liquid fuel and feedstock for making plastics, paints, and other commodity products.
Scientists reveal hidden catalytic surface of Ni-Au core-shell in CO2 hydrogenation
Dr. LIU Wei and his colleagues from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences have found that the core-shell configuration of a Ni-Au catalyst was lost during the actual reaction and recovered afterwards.
More Catalytic Reaction News and Catalytic Reaction Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Warped Reality
False information on the internet makes it harder and harder to know what's true, and the consequences have been devastating. This hour, TED speakers explore ideas around technology and deception. Guests include law professor Danielle Citron, journalist Andrew Marantz, and computer scientist Joy Buolamwini.
Now Playing: Science for the People

#576 Science Communication in Creative Places
When you think of science communication, you might think of TED talks or museum talks or video talks, or... people giving lectures. It's a lot of people talking. But there's more to sci comm than that. This week host Bethany Brookshire talks to three people who have looked at science communication in places you might not expect it. We'll speak with Mauna Dasari, a graduate student at Notre Dame, about making mammals into a March Madness match. We'll talk with Sarah Garner, director of the Pathologists Assistant Program at Tulane University School of Medicine, who takes pathology instruction out of...
Now Playing: Radiolab

What If?
There's plenty of speculation about what Donald Trump might do in the wake of the election. Would he dispute the results if he loses? Would he simply refuse to leave office, or even try to use the military to maintain control? Last summer, Rosa Brooks got together a team of experts and political operatives from both sides of the aisle to ask a slightly different question. Rather than arguing about whether he'd do those things, they dug into what exactly would happen if he did. Part war game part choose your own adventure, Rosa's Transition Integrity Project doesn't give us any predictions, and it isn't a referendum on Trump. Instead, it's a deeply illuminating stress test on our laws, our institutions, and on the commitment to democracy written into the constitution. This episode was reported by Bethel Habte, with help from Tracie Hunte, and produced by Bethel Habte. Jeremy Bloom provided original music. Support Radiolab by becoming a member today at     You can read The Transition Integrity Project's report here.