Reducing NO sub x emissions with Group IIIB compounds

Patent · Tue Jun 04 04:00:00 EDT 1991

OSTI ID:5675731

Chin, A A

This patent describes improvement in a process for the catalytic cracking of a heavy hydrocarbon feed containing nitrogen compounds by contact with a circulating inventory of catalytic cracking catalyst to produce catalytically cracked products and spent catalyst containing coke comprising nitrogen compounds. The spent catalyst is regenerated by contact with oxygen or an oxygen-containing gas in a catalyst regeneration zone operating at catalyst regeneration conditions to produce hot regenerated catalyst which is recycled to catalytically crack the heavy feed and the catalyst regeneration zone produces a flue gas comprising CO, CO{sub 2} and oxides of nitrogen (NO{sub x}). The improvement comprises: reducing the NO{sub x} content of the flue gas by adding to the circulating catalyst inventory an additive comprising discrete particles comprising oxides of Group IIIB elements, exclusive of Group III elements which are ion exchanged or impregnated into the cracking catalyst, the additive being added in an amount sufficient to reduce the production of NO{sub x} relative to operation without the additive.

• Assignee: Mobil Oil Corp., Fairfax, VA (USA)
• Patent Number(s): US 5021146; A
• Application Number: PPN: US 7-458004
• OSTI ID: 5675731
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
020800 -- Petroleum-- Waste Management
020900* -- Petroleum-- Environmental Aspects
ADDITIVES
AIR POLLUTION CONTROL
CATALYSTS
CATALYTIC CRACKING
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COKE
CONTROL
CRACKING
DECOMPOSITION
DENITRIFICATION
ENERGY SOURCES
FLUE GAS
FOSSIL FUELS
FUEL OILS
FUELS
GASEOUS WASTES
INDUSTRIAL PLANTS
LIQUID FUELS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM PRODUCTS
PETROLEUM REFINERIES
POLLUTION CONTROL
PYROLYSIS
RECYCLING
RESIDUAL FUELS
THERMOCHEMICAL PROCESSES
VISCOSITY
WASTES