scholarly journals Resonant Diffusion of Normal Alkanes in Zeolites:  Effect of the Zeolite Structure and Alkane Molecule Vibrations

1998 ◽  
Vol 102 (47) ◽  
pp. 9385-9391 ◽  
Author(s):  
Roumen Tsekov ◽  
Panagiotis G. Smirniotis
Keyword(s):  
Normal Alkanes ◽  
Zeolite Structure ◽  
Alkane Molecule

Excess molar volumes of binary mixtures of acetic acid and propionic acid with some members of homologous series of alkanes

1991 ◽  
Vol 56 (4) ◽  
pp. 736-744 ◽  
Author(s):  
Ondřej Drábek ◽  
Ivan Cibulka
Keyword(s):  
Acetic Acid ◽  
Propionic Acid ◽  
Alkyl Chain ◽  
Excess Molar Volumes ◽  
Liquid Mixtures ◽  
Entire Concentration Range ◽  
Molar Volumes ◽  
Binary Liquid ◽  
Alkane Molecule ◽  
Increasing Temperature

Excess molar volumes of binary liquid mixtures of (acetic or propionic acid = hexane) at 25 and 35°C, and (acetic or propionic acid + heptane or octane) and (acetic acid + dodecane) at 25°C, measured with a tilting dilution dilatometer, are reported. The excess volumes are positive over the entire concentration range for all mixtures and increase with increasing length of an alkane molecule, decrease with increasing of the alkyl chain in a molecule of carboxylic acid, and increase with increasing temperature.

Cyclohexylation of Naphthalene Over USY Zeolites

1999 ◽  
Vol 64 (1) ◽  
pp. 138-148 ◽  
Author(s):  
Miroslav Michvocík ◽  
Dušan Mravec ◽  
Milan Hronec ◽  
Agáta Smiešková ◽  
Pavol Hudec
Keyword(s):  
Liquid Phase ◽  
Hydrochloric Acid ◽  
Thermal Stabilization ◽  
Y Zeolite ◽  
Zeolite Structure ◽  
Positive Effect

The influence of thermal stabilization of NH4-Y zeolite and modification of USY zeolites with solutions of hydrochloric acid on the cyclohexylation of naphthalene in the liquid phase was studied. Removal of the part of extra-framework aluminium from zeolite structure has a positive effect on both conversion of naphthalene and amount of dicyclohexylnaphthalenes formed. Modification of zeolites leads to an increase in conversion and selectivity of β-substitution in the naphthalene cyclohexylation.

Cellular fatty acids derived from normal alkanes byCandida rugosa

1980 ◽  
Vol 20 (7) ◽  
pp. 449-457 ◽  
Author(s):  
M. Iida ◽  
H. Kobayashi ◽  
H. Iizuka
Keyword(s):  
Fatty Acids ◽  
Normal Alkanes ◽  
Cellular Fatty Acids

The Alkylation of Biphenyl over Fourteen-Membered Ring Zeolites. The Influence of Zeolite Structure and Alkylating Agent on the Selectivity for 4,4′-Dialkylbiphenyl

2007 ◽  
Vol 80 (7) ◽  
pp. 1418-1428 ◽  
Author(s):  
Yoshihiro Sugi ◽  
Hiroyoshi Maekawa ◽  
Shafeek Abdul Rashid Mulla ◽  
Akira Ito ◽  
Chikayo Naitoh ◽  
...  
Keyword(s):  
Alkylating Agent ◽  
Membered Ring ◽  
Zeolite Structure

Preparation and study of Mn-containing silicates of zeolite structure

1984 ◽  
Vol 26 (3-4) ◽  
pp. 259-264 ◽  
Author(s):  
L. A. Vostrikova ◽  
V. K. Ermolaev ◽  
K. G. Ione
Keyword(s):  
Zeolite Structure

Ba6Si6N10O2(CN2) - A Nitridosilicate with a NPO-Zeolite Structure Type Containing Carbodiimide Ions

2009 ◽  
Vol 2009 (18) ◽  
pp. 2678-2683 ◽  
Author(s):  
Sandro Pagano ◽  
Oliver Oeckler ◽  
Thorsten Schröder ◽  
Wolfgang Schnick
Keyword(s):  
Structure Type ◽  
Zeolite Structure

Selectivity of B, Al and Ga silicates of ZSM-5 zeolite structure in olefin synthesis from methanol

1985 ◽  
Vol 29 (1) ◽  
pp. 85-91 ◽  
Author(s):  
V. N. Romannikov ◽  
L. S. Chumachenko ◽  
V. M. Mastikhin ◽  
K. G. Ione
Keyword(s):  
Zeolite Structure ◽  
Olefin Synthesis

scholarly journals PENGARUH KONSENTRASI NaOH DAN WAKTU PENAHANAN TERHADAP KARAKTERISTIK ZEOLIT YANG DISINTESIS DARI LIMBAH GEOTHERMAL

REAKTOR ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 17
Author(s):  
Sulardjaka Sulardjaka ◽  
Deni Fajar Fitriana
Keyword(s):  
Crystal Size ◽  
Holding Time ◽  
Zeolite A ◽  
Zeolite Structure ◽  
Silica Source ◽  
Zeolite P

Abstract THE EFFECT OF CONCENTRATION OF NaOH AND HOLDING TIME ON CHARACTERISTIC OF ZEOLIT SINTHESIZED FROM GEOTHERMAL WASTE. Objective of this research is to investigate the effect of concentration of NaOH and holding time on the characteristic of synthesized zeolite from geothermal waste. Geothermal waste was used as silica source and hydrothermally processed for zeolite synthesized. Variation concentration of NaOH was 1.67, 3, and 5 M and variation of holding time are 1, 3, and 5 hours. Synthesized products were characterized by XRD, FTIR and SEM photomicrograph. It can be concluded that the rise of concentration of NaOH reduce the cristalization time and crystal size. Increasing of concentration of NaOH and holding time produce divers zeolite structure. At holding time 5 h and NaOH 1.67 M produces zeolite A. At holding time 5 h and NaOH concentration 3 M produce zeolite P. Sodalite is produced at concentration NaOH 5 M with holding time 5 h. Keywords: hydrothermal; geothermal waste; zeolite   Abstrak Penelitian ini bertujuan untuk meneliti pengaruh konsntrasi NaOH dan waktu penahanan terhadap karakteristik zeolit yang disintesis dari limbah geothermal. Limbah geothermal dipilih sebagai bahan silika pada sintesis zeolit dengan metode hidrothermal. Penelitian dilakukan dengan variasi konsentrasi NaOH: 1,67, 3, dan 5 M, dan variasi waktu penahanan 1, 3 dan 5 jam. Produk hasil sintesis dikarakterisasi dengan XRD, FTIR dan foto SEM. Hasil dari penelitian ini menunjukkan bahwa  tinggi konsentrasi NaOH kristalisasi zeolit A semakin cepat, sehingga ukuran kristal semakin kecil. Konsentrasi NaOH yang semakin tinggi dan waktu penahanan yang semakin lama, menghasilkan  jenis struktur zeolit yang lebih beragam. Pada waktu penahanan 5 jam, variasi konsentrasi NaOH 1,67 M menghasilkan zeolit A, variasi konsentrasi NaOH 3M menghasilkan zeolit P (NaP1) dan pada variasi konsentrasi NaOH 5M menghasilkan sodalit. Kata kunci: hydrothermal; limbah geothermal; zeolit

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