Nickel-based oxygen vacancy carrier catalyst as well as preparation method and application thereof

Abstract

The invention provides a nickel-based oxygen vacancy carrier catalyst as well as a preparation method and application thereof, and belongs to the field of catalytic reforming and diesel hydrogen production. With the catalyst provided by the invention adopted, the problems of low activity, easy coking and poor sulfur resistance of a diesel reforming catalyst can be solved. Cerium dioxide is used asan oxygen carrier; heterovalent metal La is doped in the CeO2 to reduce oxygen vacancy generation energy; the enhancement of the oxygen storage and release capacity of the carrier can inhibit side reactions so as to improve the activity of a main reaction. Diesel oil H / C is low, a large amount of carbon deposits are likely to occur during reforming; when coking occurs, the oxygen vacancy carriercan release more oxygen to oxidize the carbon deposits, so that coking inactivation of the catalyst is avoided. Ni particles are smaller in size and more uniform in distribution, so that the catalyticactivity of the catalyst is improved, and the catalyst can still keep excellent reforming performance after part of active metal sulfur is poisoned; the oxide of lanthanum is mainly distributed on asurface phase, so that high-temperature stability of the catalyst can be improved, and high-temperature sintering of the catalyst carrier is avoided.

Description

technical field [0001] The invention relates to the technical fields of catalytic reforming and hydrogen production from diesel oil, in particular to a nickel-based oxygen vacancy carrier catalyst and its preparation method and application. Background technique [0002] Environmental issues such as the greenhouse effect and air pollution are closely related to the sharp increase in fossil fuel consumption. Therefore, the transformation of energy structure and the sustainable use of energy have become urgent problems for human society. As a link between secondary energy and traditional energy, hydrogen energy has gradually entered people's field of vision and become a representative of clean energy. The continuous supply of hydrogen is a key link to promote the advent of the "hydrogen era". The raw materials for hydrogen production mainly include fuel, biomass and water. Hydrogen production from liquid fuel reforming, as a hydrogen production method with high energy efficie...

AI Technical Summary

Problems solved by technology

However, when applied to steam reforming of diesel oil, serious carbon deposition and sulfur poisoning deactivation occur, so it is difficult to maintain high activity and long-term catalytic performance

In order to ensure that the production cost of the catalyst meets the requirements of large-scale use and can withstand the diesel SR process, the carrier or additive of the catalyst should be adjusted. In order to ensure the mechanical strength and hydrothermal stability of the catalyst, Al 2 o 3 as the main carrier, rather than Al alone 2 o 3 As a carrier, such as using lanthanide metal oxides (La, Pr, Nd, Eu, Gd) as promoters, the activity and anti-coking performance of the catalyst have been improved to a certain extent, but there are still problems of low hydrogen yield and poor catalytic stability.

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