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Dewaxing of Diesel Fuel
315 Finally, [ should like to thank all those who have contributed to the success of News Brief, especially the Correspondents and others who have made (ontributions. Particular thanks are due to Elsevier, for their enthusiastic support and assistance, and to the Editors, especially Professor Delmon, for l:heir u n f a i l i n g e n c o u r a g e m e n t .
I']nschede lOth November
Julian Ross
1985
S t ~ u c t u r e of ZSbl-5 at High Temperature
New Meetings
A recent article in the Chinese journal, J.Fue~ Chemistry and Technology (]3 (J985) 106) by Liu Zhenyi and his colleagues has described the structure of the zeolite ZSM-5 at high temperature. The crystal structure of a polycrystalline sample of ZSM-5 treated at high temperature in steam at 500 ° to 550~C was determined by X-ray diffraction at o~ " 500 (.. The symmetry of _the crystal chanoed from space group ~ ~h-F2~, (at room temperattH'e) to C ~ -P ~ (at O ZV A, 500 C). The s t r u c t u r e r e v e r t e ~ ~o the o r i g i n a l when the sample was cooled to room t e m p e r a t u r e a g a i n . At 500°C, the t h r e e parameters of the structure related to shape selectivity, i.e. the size and shape of the openings of both the straight and Z-form channels and the bend angle of the Z-form channels are similar to those at room temperature. It can thus be concluded that the decrease of the shape selectivity of ZSM-5 observed at elevated temperatures is due to un [ncrease in the number of active molecules of iso-hvdrocarbons rather than to significant changes in the physical dimensions of the channels and openings.
Two new meetings have been added to the Calendar of Forthcoming Events this month. The first of these is the 1986 Joint Spring Symposium hosted by the New York and New England Catalysis Societies which is to be held on 19th March at the Davies Auditorium of Yale University. For further details, contact Dr. Alan Rosan, whose address is given in the CaJendar. The second new entry is the Second International Meeting on Chemical Sensors which ]s to be held in Bordeaux from 7th to ]Oth July, 1986. Organised by a committee chaired by Professor P. Hagenmuller, the meeting will be concerned with semi-conductor gas sensors, solid-electrolyte gas sensors, humidity detectors, FET chemical sensors, ion selective electrode dsensors, biosensors and new sensing devices. The meeting is a follow-up to the first meeting held in Fukuoka in September 1983. For further information, contact the secretary of the organJsing committee, Dr. Claude Lucat, whose address is also given in the Calendar.
Methane Oxidation Dewaxing of Diesel
Fuel
A recent short communication in the Chinese journal Petrochemical Processing (No. 7 (]985) 64) has announced a new catalyst, CTL-I. This is said to be made from ZSM-5 zeolite and to be usable in "non-hydro-dewaxing" of diesel fuel under a low pressure of less than 5 kg/m 2. The pour point of both light and heavy diesel rue[ obtained by distillation of crude oil and catalytic cracking can be reduced by up to 20 ° -60°C. The liquid recovery range is reported as being 80-95%, 70-85% of which can be used as diesel fuel. A plant at Harbin Refinery with dewaxing units with a 20,000 ton per year capacity operated sucessfully with this catalyst for three months in 1984. Wang Dingzhu
apldled catalysis
_ V o l u m e 2 0 , No. 1 - 2 - January 1 9 8 6
Like me, you will probably have read with interest the review on the conversion of methane to methanol by Niel R. Foster which appeared in Applied Catalysis in November (19 (1985) l). Hence another review on the same subject which appeared while the Foster article was in press will also be of interest. This is by Hymand D. Gesser, Norman R. Hunter and Chandra B. Prakash and appeared in Chemical Reviews, 85 (1985) 235. This review includes some data from the very promising work carried out Gesser and his coworkers and only summarised briefly by Foster. Methanol yields of between 30 and 81% are reported with a methane conversion of about 8%. It is gratifying to note that News Brief is quoted twice in the Gesser review as a source of information. Julian Ross
I']nschede lOth November
Julian Ross
1985
S t ~ u c t u r e of ZSbl-5 at High Temperature
New Meetings
A recent article in the Chinese journal, J.Fue~ Chemistry and Technology (]3 (J985) 106) by Liu Zhenyi and his colleagues has described the structure of the zeolite ZSM-5 at high temperature. The crystal structure of a polycrystalline sample of ZSM-5 treated at high temperature in steam at 500 ° to 550~C was determined by X-ray diffraction at o~ " 500 (.. The symmetry of _the crystal chanoed from space group ~ ~h-F2~, (at room temperattH'e) to C ~ -P ~ (at O ZV A, 500 C). The s t r u c t u r e r e v e r t e ~ ~o the o r i g i n a l when the sample was cooled to room t e m p e r a t u r e a g a i n . At 500°C, the t h r e e parameters of the structure related to shape selectivity, i.e. the size and shape of the openings of both the straight and Z-form channels and the bend angle of the Z-form channels are similar to those at room temperature. It can thus be concluded that the decrease of the shape selectivity of ZSM-5 observed at elevated temperatures is due to un [ncrease in the number of active molecules of iso-hvdrocarbons rather than to significant changes in the physical dimensions of the channels and openings.
Two new meetings have been added to the Calendar of Forthcoming Events this month. The first of these is the 1986 Joint Spring Symposium hosted by the New York and New England Catalysis Societies which is to be held on 19th March at the Davies Auditorium of Yale University. For further details, contact Dr. Alan Rosan, whose address is given in the CaJendar. The second new entry is the Second International Meeting on Chemical Sensors which ]s to be held in Bordeaux from 7th to ]Oth July, 1986. Organised by a committee chaired by Professor P. Hagenmuller, the meeting will be concerned with semi-conductor gas sensors, solid-electrolyte gas sensors, humidity detectors, FET chemical sensors, ion selective electrode dsensors, biosensors and new sensing devices. The meeting is a follow-up to the first meeting held in Fukuoka in September 1983. For further information, contact the secretary of the organJsing committee, Dr. Claude Lucat, whose address is also given in the Calendar.
Methane Oxidation Dewaxing of Diesel
Fuel
A recent short communication in the Chinese journal Petrochemical Processing (No. 7 (]985) 64) has announced a new catalyst, CTL-I. This is said to be made from ZSM-5 zeolite and to be usable in "non-hydro-dewaxing" of diesel fuel under a low pressure of less than 5 kg/m 2. The pour point of both light and heavy diesel rue[ obtained by distillation of crude oil and catalytic cracking can be reduced by up to 20 ° -60°C. The liquid recovery range is reported as being 80-95%, 70-85% of which can be used as diesel fuel. A plant at Harbin Refinery with dewaxing units with a 20,000 ton per year capacity operated sucessfully with this catalyst for three months in 1984. Wang Dingzhu
apldled catalysis
_ V o l u m e 2 0 , No. 1 - 2 - January 1 9 8 6
Like me, you will probably have read with interest the review on the conversion of methane to methanol by Niel R. Foster which appeared in Applied Catalysis in November (19 (1985) l). Hence another review on the same subject which appeared while the Foster article was in press will also be of interest. This is by Hymand D. Gesser, Norman R. Hunter and Chandra B. Prakash and appeared in Chemical Reviews, 85 (1985) 235. This review includes some data from the very promising work carried out Gesser and his coworkers and only summarised briefly by Foster. Methanol yields of between 30 and 81% are reported with a methane conversion of about 8%. It is gratifying to note that News Brief is quoted twice in the Gesser review as a source of information. Julian Ross