Gold-based mercury-free catalyst project for the synthesis of vinyl chloride was awarded

Completely solve the problem of mercury pollution in the PVC industry from the source

Completely solve the problem of mercury pollution in the PVC industry from the source

Sinochem News Network News on June 6th, the reporter learned from Nankai University that the research and industrial application project of gold-based mercury-free catalyst for the synthesis of vinyl chloride led by Professor Li Wei from the School of Chemistry of Nankai University won the Tianjin Science and Technology Award 2020 The first prize of annual technological invention
.

Vinyl chloride is a monomer for the synthesis of polyvinyl chloride (PVC).
There are two mature synthesis methods: acetylene method and ethylene method.
The acetylene method using coal as raw material is the mainstream process for PVC production in China
.

At present, in the core catalysis of vinyl chloride synthesis, almost all mercury chloride catalysts supported by activated carbon are used, which makes PVC production the industry with the largest amount of mercury in China

Li Wei's team began research and development of mercury-free catalysts in 2009
.

In view of the high cost of gold-based catalysts and the decline in long-term stability under industrial conditions, the project team focused on designing and preparing high-activity, ultra-low content gold-based catalysts, and studied its reaction path in industrial feed gas And inactivation mechanism

They used the strategy of constructing metal coordination compounds as active domains to improve the dispersion of gold components, enhance the activity of the catalyst, and improve the anti-reduction performance of Au3+ and Au+ in the gold-based catalyst in industrial feed gas
.

By combining small-scale experiments, industrial side-line experiments, in-situ characterization and theoretical calculations, the team studied the reaction mechanism and anti-reduction performance of the catalyst, and initially revealed the carbon deposition mechanism of the catalyst, thereby improving the long-term stability of the catalyst

The team has cooperated with many PVC companies to develop and realize the industrial production and application of mercury-free catalysts.
In 2019, the team has cooperated with the company to build the first domestic mercury-free catalyst thousand-ton production line, and has also obtained 10 invention patent authorizations.
He has 16 SCI papers and won 1 Tianjin Patent Entrepreneurship Award in 2018
.

At present, China has issued a policy to force new PVC companies to ban the use of mercury-containing catalysts after 2020, and strongly support the research and development of mercury-free catalysts
.

Li Wei’s team developed high-efficiency green mercury-free catalysts and related supporting production and use technologies to realize the mercury-free production of vinyl chloride, completely solve the problem of mercury pollution in the PVC industry from the source, realize the technology upgrade of the PVC industry, and promote the health and health of the chlor-alkali industry.