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Title: Thermal and catalytic cracking of tars and tar constituents from coal-gasification processes. Final report. [Synthetic zeolites (Linde LZ-Y82, Norton Zeolon 900-H, Davison 13-X, faujasite), natural zeolite (chabazite)]

Abstract

The objective of this program is to screen catalysts and determine operating conditions for maximizing gas and char production from the pyrolysis of coal gasification tars. The product yields from cracking a bituminous coal tar in a fixed-bed reactor were determined at various temperatures in the presence and absence of some packing materials. Synthetic zeolites, Linde LZ-Y82, Norton Zeolon 900-H (mordenite), Davison 13-X, and ultra-stable faujasite (H-Y), as well as a natural zeolite, chabazite, showed strong catalytic activity. In contrast, molecular sieves 5-A and natural erionite having smaller pore diameters were found to be much less active. Clay minerals such as kaolinite, montmorillonite and Kieselguhr exhibited catalytic activities which were similar to those of the zeolites with small pore sizes, but they were still far more effective than quartz particles. Based on the assumption of first-order kinetics, the activation energies for the tar conversion were evaluated for several packing materials. It was found that the zeolite LZ-Y82 was remarkably effective in converting tar to chars and gases in the temperature range of 350 to 500/sup 0/C, although this effectiveness decreased very rapidly with a continuous tar feed carried by an inert gas. Among the factors involved for catalytic effectiveness aremore » (1) the effective pore size greater than about 0.7 nm (or 7A), (2) large internal surface area accessible to the tar vapor, and (3) large number of strongly acidic sites. 22 references, 6 figures, 22 tables.« less

Authors:
Publication Date:
Research Org.:
Clark Univ., Worcester, MA (USA). Dept. of Chemistry
OSTI Identifier:
5618473
Report Number(s):
DOE/MC/14385-1484
ON: DE84002012
DOE Contract Number:  
AC21-80MC14385
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CATALYSTS; SCREENING; CHARS; YIELDS; COAL TAR; CATALYTIC CRACKING; PYROLYSIS; DIATOMACEOUS EARTH; CATALYTIC EFFECTS; FUEL OILS; KAOLINITE; MOLECULAR SIEVES; MONTMORILLONITE; ZEOLITES; BITUMINOUS COAL; COAL GASIFICATION; EXPERIMENTAL DATA; HIGH TEMPERATURE; OPTIMIZATION; PACKINGS; SURFACE AREA; ADSORBENTS; ALUMINIUM COMPOUNDS; ALUMINIUM SILICATES; BLACK COAL; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; CLAYS; COAL; CRACKING; DATA; DECOMPOSITION; ENERGY SOURCES; FOSSIL FUELS; FUELS; GASIFICATION; INFORMATION; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; LIQUID FUELS; MATERIALS; MINERALS; NUMERICAL DATA; OILS; ORGANIC COMPOUNDS; OTHER ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; PETROLEUM PRODUCTS; PYROLYSIS PRODUCTS; SILICATE MINERALS; SILICATES; SILICON COMPOUNDS; SURFACE PROPERTIES; TAR; THERMOCHEMICAL PROCESSES; 010404* - Coal, Lignite, & Peat- Gasification; 010500 - Coal, Lignite, & Peat- Products & By-Products

Citation Formats

Wen, W Y. Thermal and catalytic cracking of tars and tar constituents from coal-gasification processes. Final report. [Synthetic zeolites (Linde LZ-Y82, Norton Zeolon 900-H, Davison 13-X, faujasite), natural zeolite (chabazite)]. United States: N. p., 1983. Web.
Wen, W Y. Thermal and catalytic cracking of tars and tar constituents from coal-gasification processes. Final report. [Synthetic zeolites (Linde LZ-Y82, Norton Zeolon 900-H, Davison 13-X, faujasite), natural zeolite (chabazite)]. United States.
Wen, W Y. Sat . "Thermal and catalytic cracking of tars and tar constituents from coal-gasification processes. Final report. [Synthetic zeolites (Linde LZ-Y82, Norton Zeolon 900-H, Davison 13-X, faujasite), natural zeolite (chabazite)]". United States.
@article{osti_5618473,
title = {Thermal and catalytic cracking of tars and tar constituents from coal-gasification processes. Final report. [Synthetic zeolites (Linde LZ-Y82, Norton Zeolon 900-H, Davison 13-X, faujasite), natural zeolite (chabazite)]},
author = {Wen, W Y},
abstractNote = {The objective of this program is to screen catalysts and determine operating conditions for maximizing gas and char production from the pyrolysis of coal gasification tars. The product yields from cracking a bituminous coal tar in a fixed-bed reactor were determined at various temperatures in the presence and absence of some packing materials. Synthetic zeolites, Linde LZ-Y82, Norton Zeolon 900-H (mordenite), Davison 13-X, and ultra-stable faujasite (H-Y), as well as a natural zeolite, chabazite, showed strong catalytic activity. In contrast, molecular sieves 5-A and natural erionite having smaller pore diameters were found to be much less active. Clay minerals such as kaolinite, montmorillonite and Kieselguhr exhibited catalytic activities which were similar to those of the zeolites with small pore sizes, but they were still far more effective than quartz particles. Based on the assumption of first-order kinetics, the activation energies for the tar conversion were evaluated for several packing materials. It was found that the zeolite LZ-Y82 was remarkably effective in converting tar to chars and gases in the temperature range of 350 to 500/sup 0/C, although this effectiveness decreased very rapidly with a continuous tar feed carried by an inert gas. Among the factors involved for catalytic effectiveness are (1) the effective pore size greater than about 0.7 nm (or 7A), (2) large internal surface area accessible to the tar vapor, and (3) large number of strongly acidic sites. 22 references, 6 figures, 22 tables.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {10}
}

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