PMID- 29267245
OWN - NLM
STAT- MEDLINE
DCOM- 20190110
LR  - 20190110
IS  - 1420-3049 (Electronic)
IS  - 1420-3049 (Linking)
VI  - 23
IP  - 1
DP  - 2017 Dec 21
TI  - Comparative Study between Direct and Pseudomorphic Transformation of Rice Husk 
      Ash into MFI-Type Zeolite.
LID - 10.3390/molecules23010001 [doi]
LID - 1
AB  - Pre-shaped mesoporous amorphous rice husk ash (RHA) and MCM-41 derived from RHA 
      as a silica source were transformed into MFI-type zeolites using two different 
      structure-directing agents. Tetrapropylammonium hydroxide (TPAOH) was utilized as 
      an alkali source for silica dissolution and structure control during the direct 
      transformation of RHA into zeolite. A monopropylamine (PA)-containing alkaline 
      solution (NaOH) was used for the pseudomorphic transformation of RHA or MCM-41 
      into zeolite. The hydrothermal conversion of RHA or MCM-41 into MFI-type zeolites 
      was investigated as a function of reaction time at 175  degrees C. With PA as template, 
      the crystallization took place inside and on the outer surface of RHA or MCM-41 
      without losing the original shape of the initial silica sources, while TPAOH led 
      to the formation of conventional MFI-type zeolite crystals due to the complete 
      dissolution of RHA. The final products were characterized by X-ray diffraction, 
      nitrogen adsorption, scanning electron microscopy, and optical emission 
      spectroscopy.
FAU - Alyosef, Hallah Ahmad
AU  - Alyosef HA
AUID- ORCID: 0000-0002-2345-7738
AD  - Institute of Chemical Technology, Universitat Leipzig, Linnestr. 3, 04103 
      Leipzig, Germany. hallah.alyosef81@gmail.com.
FAU - Roggendorf, Hans
AU  - Roggendorf H
AD  - Institute of Physics, Martin-Luther-University Halle-Wittenberg, 06120 Halle 
      (Saale), Germany. hans.roggendorf@physik.uni-halle.de.
FAU - Schneider, Denise
AU  - Schneider D
AUID- ORCID: 0000-0002-0450-9176
AD  - Institute of Chemical Technology, Universitat Leipzig, Linnestr. 3, 04103 
      Leipzig, Germany. denise.schneider@uni-leipzig.de.
FAU - Inayat, Alexandra
AU  - Inayat A
AD  - Institute of Chemical Reaction Engineering, Friedrich-Alexander University 
      Erlangen-Nurnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany. 
      alexandra.inayat@fau.de.
FAU - Welscher, Julia
AU  - Welscher J
AD  - Institute of Chemical Reaction Engineering, Friedrich-Alexander University 
      Erlangen-Nurnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany. 
      julia.welscher@fau.de.
FAU - Schwieger, Wilhelm
AU  - Schwieger W
AD  - Institute of Chemical Reaction Engineering, Friedrich-Alexander University 
      Erlangen-Nurnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany. 
      wilhelm.schwieger@fau.de.
FAU - Munster, Tom
AU  - Munster T
AD  - Institute of Mineralogy, Crystallography and Materials Science, Universitat 
      Leipzig, Scharnhorststrasse 20, 04275 Leipzig, Germany. tom.muenster@gmx.de.
FAU - Kloess, Gert
AU  - Kloess G
AD  - Institute of Mineralogy, Crystallography and Materials Science, Universitat 
      Leipzig, Scharnhorststrasse 20, 04275 Leipzig, Germany. kloess@uni-leipzig.de.
FAU - Ibrahim, Suzan
AU  - Ibrahim S
AD  - Central Metallurgical Research & Development Institute (CMRDI), P.O. Box 87, 
      Helwan 11421, Egypt. suzansibrahim@gmail.com.
FAU - Enke, Dirk
AU  - Enke D
AD  - Institute of Chemical Technology, Universitat Leipzig, Linnestr. 3, 04103 
      Leipzig, Germany. dirk.enke@uni-leipzig.de.
LA  - eng
PT  - Comparative Study
PT  - Journal Article
DEP - 20171221
PL  - Switzerland
TA  - Molecules
JT  - Molecules (Basel, Switzerland)
JID - 100964009
RN  - 0 (MCM-41)
RN  - 1318-02-1 (Zeolites)
RN  - 7631-86-9 (Silicon Dioxide)
RN  - N762921K75 (Nitrogen)
SB  - IM
MH  - Adsorption
MH  - Crystallization/*methods
MH  - Microscopy, Electron, Scanning/methods
MH  - Nitrogen/chemistry
MH  - Oryza/*chemistry
MH  - Photoelectron Spectroscopy/methods
MH  - Porosity
MH  - Silicon Dioxide/*chemical synthesis
MH  - Surface Properties
MH  - Temperature
MH  - X-Ray Diffraction/methods
MH  - Zeolites/*chemical synthesis
PMC - PMC5943920
OTO - NOTNLM
OT  - MCM-41
OT  - MFI-type zeolite
OT  - amorphous
OT  - hydrothermal treatment
OT  - pseudomorphic transformation
OT  - rice husk ash
COIS- The authors declare no conflict of interest. The founding sponsors had no role in 
      the design of the study; in the collection, analyses, or interpretation of data; 
      in the writing of the manuscript, and in the decision to publish the results.
EDAT- 2017/12/22 06:00
MHDA- 2019/01/11 06:00
PMCR- 2017/12/21
CRDT- 2017/12/22 06:00
PHST- 2017/11/03 00:00 [received]
PHST- 2017/12/13 00:00 [revised]
PHST- 2017/12/16 00:00 [accepted]
PHST- 2017/12/22 06:00 [entrez]
PHST- 2017/12/22 06:00 [pubmed]
PHST- 2019/01/11 06:00 [medline]
PHST- 2017/12/21 00:00 [pmc-release]
AID - molecules23010001 [pii]
AID - molecules-23-00001 [pii]
AID - 10.3390/molecules23010001 [doi]
PST - epublish
SO  - Molecules. 2017 Dec 21;23(1):1. doi: 10.3390/molecules23010001.