A kind of gasoline highly selective adsorption desulfurizer and its preparation method and application

Abstract

The invention discloses a gasoline highly selective adsorption desulfurizer and its preparation method and application. Calculated by weight percentage, the gasoline highly selective adsorption desulfurizer consists of 7.7-13.2% of nickel oxide, 12.5-28.7% of zinc oxide and residual A certain amount of nitrogen-containing carbon aerogel is composed; wherein nickel oxide: the mol ratio of zinc oxide is 1:1.2-2; the specific surface area of ​​the nitrogen-containing carbon aerogel is 400-900m 2 / g, pore diameter 5‑20nm, mesopore volume 1.0‑3.0cm 3 / g, nitrogen content 0.5‑4wt%. Its preparation method is to add nitrogen-containing carbon airgel into the impregnating liquid, immerse for 24 hours, dry at 80°C, and roast at 400°C under the protection of nitrogen to obtain a highly selective desulfurization adsorbent for gasoline. It is used for desulfurization of gasoline with a sulfur content of 100‑1000µg / g. When the RON loss is less than 2.0, gasoline with a sulfur content of less than 3µg / g can be obtained.

Description

technical field [0001] The invention relates to the technical field of ultra-clean oil production, in particular to a gasoline highly selective adsorption desulfurizer and its preparation method and application. Background technique [0002] As the use of fuel oil (gasoline, diesel) continues to increase worldwide, the environmental hazards of the exhaust gas generated after fuel combustion are also becoming more and more serious. The combustion of sulfur in gasoline produces sulfur oxides (SO x ) is one of the main pollutants in the atmosphere, and its discharge into the air will form acid rain and destroy the ecological environment. In addition, sulfur oxides can also corrode and damage engine components, poison motor vehicle exhaust gas treatment adsorbents, reduce their catalytic activity, increase the emission of particulate pollutants, and aggravate urban environmental pollution. At present, European and American countries have implemented the Euro V gasoline standar...

AI Technical Summary

Problems solved by technology

The S-Zorb adsorbent mainly uses Ni-ZnO as the active component, diatomaceous earth-Al 2 o 3 As a carrier component, the formation of zinc-aluminum spinel and willemite and other inactive zinc-containing phases during operation will lead to a significant reduction in the effective ZnO content in the adsorbent. When the amount of ZnO is reduced to not enough to complete the transfer of adsorbed sulfur At this time, the deactivation of the adsorbent and the reduction of the desulfurization efficiency will appear in the process, and the formation of zinc-aluminum spinel will lead to a decrease in the strength of the adsorbent, making the adsorbent particles more easily broken and increasing the consumption of the adsorbent.

In addition, due to the NiO component and the carrier Al 2 o 3 The role is very strong, forming NiAl 2 o 4 The spinel structure leads to a high reduction temperature of NiO. After reduction by hydrogen, there are few active centers of elemental nickel on the surface, resulting in low desulfurization activity of the adsorbent, making it difficult to regenerate the adsorbent after sulfidation, and the life of the adsorbent is relatively short. short

In addition, this technology has the problem of secondary pollution and disposal of waste adsorbents

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