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Institution

Riau University

EducationPekanbaru, Indonesia
About: Riau University is a education organization based out in Pekanbaru, Indonesia. It is known for research contribution in the topics: Population & Stock exchange. The organization has 4135 authors who have published 3895 publications receiving 15782 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, various technological methods to produce biodiesel being used in industries and academia are reviewed, and the most common types of catalysts; homogeneous liquids and heterogeneous solids, are discussed at length in the paper.

619 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reviewed various types of heterogeneous solid acids and bases in the production of biodiesel from transesterification of triglycerides and compared the yields and conversion from various catalytic systems.
Abstract: Increasing number of researches focusing on the use of solid heterogeneous catalysts for the production of biodiesel provides evidence that these catalysts continue to evolve as viable alternatives. While liquid alkaline metal alkoxides remain to be appealing in the industries, it is expected that solid base catalyst will soon become more attractive due to the economics and environmental concern. Limited researches have shown that the conversion by solid base catalysts was comparable to that of the existing alkoxide system. This paper reviews various types of heterogeneous solid acids and bases in the production of biodiesel from transesterification of triglycerides. Unconventional enzymatic and non-catalytic supercritical methanol transesterification are also presented. The yields and conversion from various catalytic systems are compared, and the advantages and disadvantages of the systems discussed.

563 citations

Journal ArticleDOI
TL;DR: A series of manganese oxides (MnO, MnO2, Mn2O3 and Mn3O4) were synthesized and tested in heterogeneous activation of peroxymonosulfate (PMS) for phenol degradation in aqueous solutions as discussed by the authors.
Abstract: A series of manganese oxides (MnO, MnO2, Mn2O3 and Mn3O4) were synthesized and tested in heterogeneous activation of peroxymonosulfate (PMS) for phenol degradation in aqueous solutions. Their properties were characterized by several techniques such as X-ray diffraction (XRD), thermogravimetric-differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), and N2 adsorption/desorption isotherms. Catalytic activities of Mn oxides were found to be closely related to the chemical states of Mn. Mn2O3 is highly effective in heterogeneous activation of PMS to produce sulfate radicals for phenol degradation compared with other catalysts (MnO, MnO2, and Mn3O4). The activity shows an order of Mn2O3 > MnO > Mn3O4 > MnO2. Mn2O3 could completely remove phenol in 60 min at the conditions of 25 mg/L phenol, 0.4 g/L catalyst, 2 g/L PMS, and 25 °C. After heat regeneration, the activity could be fully recovered. A pseudo first order model would fit to phenol degradation kinetics and activation energy was obtained as 11.4 kJ/mol.

421 citations

Journal ArticleDOI
TL;DR: Characterisation of the pore structure of the electrodes revealed a significant advantage from combining the chemical and physical activation processes, and found that approximately 3h of activation time, achieved via a multi-step heating profile, produced electrodes with a high surface area.

310 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of brand association, brand loyalty, brand awareness, and brand image on brand equity among young consumers were examined using descriptive, correlation and multiple regression analysis via the Statistical Package for Social Sciences computer program version 21.
Abstract: Purpose – The purpose of this paper is to examine the effects of brand association, brand loyalty, brand awareness, and brand image on brand equity among young consumers. Design/methodology/approach – Data from 200 young consumers were analysed using descriptive, correlation and multiple regression analysis via the Statistical Package for Social Sciences computer programme version 21. Findings – Empirical results via multiple regressions authenticated that brand awareness predominantly affects brand equity among young consumers. These young consumers get input and awareness of the particular product or brand from the social media. They can clearly recognize the particular product or brand in comparison to competing products or brands and know how it looks and its characteristics from the social media. Research limitations/implications – Respondents were randomly drawn from the population of the full time students in a public university in Malaysia. Consequently, they may not represent the entire populatio...

253 citations


Authors

Showing all 4214 results

NameH-indexPapersCitations
David Evans31804712
Jalil Ali283653165
Hamid Nikraz254573236
Abdullah Abdullah222021797
Mohamad Deraman21771552
Muhammad Ihsan18871957
Habibis Saleh17831004
Erman Taer161371141
Amun Amri1585807
Sri Wahyuni153171046
Edy Saputra13681539
Abdul Hadi12105695
Muhamad Syukur12157630
Evelyn1224498
Zuchra Helwani12621619
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202337
202259
2021566
2020786
2019634
2018529