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二氧化錳丨β-二氧化錳

包裝規(guī)格照片及說明：500g/瓶

執(zhí)行標(biāo)準(zhǔn)：GB

用途：用于錳鹽的制備，也用作氧化劑、除銹劑、催化劑。

數(shù)量： - 1 + g

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　　二氧化錳，是一種無機化合物，化學(xué)式為MnO2，為黑色無定形粉末或黑色斜方晶體，難溶于水、弱酸、弱堿、硝酸、冷硫酸，加熱情況下溶于濃鹽酸而產(chǎn)生氯氣。用于錳鹽的制備，也用作氧化劑、除銹劑、催化劑。
　　
　　應(yīng)用領(lǐng)域
　　
　　用作干電池去極劑，合成工業(yè)的催化劑和氧化劑，玻璃工業(yè)和搪瓷工業(yè)的著色劑、消色劑、脫鐵劑等。用于制造金屬錳、特種合金、錳鐵鑄件、防毒面具和電子材料鐵氧體等。另外，還可用于橡膠工業(yè)以增加橡膠的粘性。還可在化學(xué)實驗中用做催化劑。
　　
　　有機合成用途
　　
　　二氧化錳在有機化學(xué)之中十分有用。被用于氧化物的二氧化錳的形態(tài)不一，因為二氧化錳有多個結(jié)晶形態(tài)，化學(xué)式可以寫成MnO2·x(H2O)n，其中x介乎0至0.5之間，而n可以大于0。二氧化錳可在不同pH下的高錳酸鉀（KMnO?）和硫酸錳（MnSO?）的反應(yīng)之中產(chǎn)生。
　　
　　其中一個二氧化錳專用的化學(xué)反應(yīng)是將醇類轉(zhuǎn)化為醛類。即使該醇類中有雙鍵，也不會被二氧化錳所氧化：
　　
　　當(dāng)中的產(chǎn)物即使有多活躍也不會再被氧化。二醇類可被二氧化錳氧化為二醛。其他二氧化錳的反應(yīng)極之多，可用在氧化出胺、芳香物和三醇等。
　　
　　實驗室用途
　　
　　用作過氧化氫分解制氧氣時的催化劑；用作加熱氯酸鉀分解制氧氣時的催化劑；與單質(zhì)鋁粉發(fā)生鋁熱反應(yīng)，制得錳。用作顏料、黃色玻璃等；與熱的濃鹽酸反應(yīng)制取氯氣；與熔融苛性鉀（氫氧化鉀）在空氣中反應(yīng)制取錳酸鉀；高錳酸鉀分解反應(yīng)中，二氧化錳作為高錳酸鉀的自催化劑。

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C:\phpstudy\PHPTutorial\WWW\shop\index.php ( 1.16 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\ThinkPHP.php ( 4.42 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\Think.class.php ( 11.53 KB )
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C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Common\functions.php ( 44.69 KB )
C:\phpstudy\PHPTutorial\WWW\shop\Application\Common\Common\function.php ( 30.67 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\Hook.class.php ( 4.19 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\App.class.php ( 12.57 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\Dispatcher.class.php ( 14.43 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\Route.class.php ( 13.37 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\Controller.class.php ( 10.84 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\View.class.php ( 7.44 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Behavior\ParseTemplateBehavior.class.php ( 3.89 KB )
C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Behavior\ContentReplaceBehavior.class.php ( 1.91 KB )
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C:\phpstudy\PHPTutorial\WWW\shop\Application\Common\Conf\config.php ( 2.05 KB )
C:\phpstudy\PHPTutorial\WWW\shop\Application\Common\Conf\tags.php ( 0.07 KB )
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C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Conf\debug.php ( 1.59 KB )
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C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\Behavior.class.php ( 0.88 KB )
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C:\phpstudy\PHPTutorial\WWW\shop\ThinkPHP\Library\Think\Cache\Driver\File.class.php ( 5.88 KB )
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SHOW COLUMNS FROM `onethink_shop` [ RunTime:0.000000s ]
SELECT * FROM `onethink_shop` WHERE ( `id` = 520 ) LIMIT 1 [ RunTime:0.000000s ]
SELECT * FROM `onethink_shop` WHERE ( `id` = 520 ) LIMIT 1 [ RunTime:0.000000s ]
SHOW COLUMNS FROM `onethink_hot` [ RunTime:0.000000s ]
SELECT * FROM `onethink_hot` [ RunTime:0.000000s ]
select * from fn_category where parentid=6 [ RunTime:0.000000s ]
select * from fn_category where parentid=7 limit 0,2 [ RunTime:0.000000s ]
select * from fn_category where parentid=7 limit 0,8 [ RunTime:0.000000s ]
select * from fn_category where parentid=8 limit 0,2 [ RunTime:0.000000s ]
select * from fn_category where parentid=8 limit 0,8 [ RunTime:0.000000s ]
select * from fn_category where parentid=9 limit 0,2 [ RunTime:0.000000s ]
select * from fn_category where parentid=9 limit 0,8 [ RunTime:0.000000s ]
select * from fn_category where parentid=18 limit 0,2 [ RunTime:0.000000s ]
select * from fn_category where parentid=18 limit 0,8 [ RunTime:0.015625s ]
select * from fn_category where parentid=19 limit 0,2 [ RunTime:0.000000s ]
select * from fn_category where parentid=19 limit 0,8 [ RunTime:0.000000s ]
select * from fn_category where parentid=21 limit 0,2 [ RunTime:0.000000s ]
select * from fn_category where parentid=21 limit 0,8 [ RunTime:0.000000s ]
select * from fn_category where parentid=106 limit 0,2 [ RunTime:0.000000s ]
select * from fn_category where parentid=106 limit 0,8 [ RunTime:0.000000s ]
select * from fn_position_data where posid=1 and id!=25 limit 0,3 [ RunTime:0.000000s ]
SHOW COLUMNS FROM `onethink_banner` [ RunTime:0.000000s ]
SELECT * FROM `onethink_banner` LIMIT 1 [ RunTime:0.000000s ]
select * from fn_category where catid=44 [ RunTime:0.000000s ]
select * from fn_category where parentid=7 [ RunTime:0.000000s ]
select * from fn_category where parentid=8 [ RunTime:0.000000s ]
select * from fn_category where parentid=9 [ RunTime:0.000000s ]
select * from fn_category where parentid=18 [ RunTime:0.015625s ]
select * from fn_category where parentid=19 [ RunTime:0.000000s ]
select * from fn_category where parentid=21 [ RunTime:0.000000s ]
select * from fn_category where parentid=106 [ RunTime:0.000000s ]
SELECT * FROM `onethink_shop` WHERE ( `is_tuijian` = 1 ) LIMIT 0,5 [ RunTime:0.000000s ]
SHOW COLUMNS FROM `onethink_news_type` [ RunTime:0.000000s ]
SELECT * FROM `onethink_news_type` [ RunTime:0.000000s ]
SHOW COLUMNS FROM `onethink_footer_news` [ RunTime:0.015625s ]
SELECT * FROM `onethink_footer_news` WHERE ( `typelist` = 1 ) [ RunTime:0.000000s ]
SELECT * FROM `onethink_footer_news` WHERE ( `typelist` = 2 ) [ RunTime:0.000000s ]
SELECT * FROM `onethink_footer_news` WHERE ( `typelist` = 3 ) [ RunTime:0.000000s ]
SELECT * FROM `onethink_footer_news` WHERE ( `typelist` = 4 ) [ RunTime:0.000000s ]
SHOW COLUMNS FROM `onethink_friend` [ RunTime:0.031250s ]
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